A rolling mill backup roll quick change device and method

Abstract

The application relates to a rolling mill supporting roller quick replacement device and method, and belongs to the technical field of rolling mill roller replacement in the metallurgical industry. The technical scheme is as follows: two columns (022) are fixed on a base (021) respectively, and the two columns (022) are connected together through a connecting cross pipe (023); a base frame (201) is fixed on the base (021) in a roller replacement support (1), V-shaped sliding blocks (3) matched with V-shaped tracks (011) and flat sliding blocks (4) matched with working roller flat tracks (012) are arranged below the base frame (201), and the V-shaped tracks (011) and the working roller flat tracks (012) form working roller tracks (01). The application has the beneficial effects that the roller replacement support can be transported under the condition that the supporting roller is not pushed out of the rolling mill in a limited space, the roller replacement support does not need to be frequently transported by means of being pushed out or pulled out, and the quick replacement of the supporting roller of the rolling mill is completed.

Description

Technical Field

[0001] This invention relates to a quick replacement device and method for rolling mill support rolls, belonging to the field of rolling mill roll replacement technology in the metallurgical industry. Background Technology

[0002] Roller support rolls are used to support the work rolls to prevent them from bending and deforming, which would affect the output and quality of plates and strips. They are one of the key pieces of equipment in hot continuous rolling and wide and medium-thick plate production lines. To control rolling accuracy and ensure product quality, the support rolls need to be replaced after a period of rolling. Due to their large diameter and heavy weight, the replacement process is quite complicated.

[0003] See appendix Figure 15 The usual steps for replacing the support rolls of a rolling mill are as follows: (1) After stopping the machine and removing the work rolls, open the transverse platform and remove the lower support roll 04; (2) Hoist the support roll changing bracket 02 onto the lower support roll bearing seat and adjust its position so that the positioning key 041 on the lower support roll coincides with the keyway 0211 of the changing bracket; (3) Push in the lower support roll with the changing bracket; (4) Lower the upper support roll 05 onto the changing bracket, remove the upper and lower support rolls and lift them off, replace them with new upper and lower support rolls and push them in, and lift the upper support roll to separate it from the changing bracket; (5) Remove the lower support roll; (6) Lift off the tooling; (7) Push in the lower support roll and perform subsequent recovery operations.

[0004] The original roll changing bracket 02 mainly consists of a base 021, a column 022, a connecting horizontal tube 023, and a connecting vertical tube 024. It primarily supports the upper support roll, allowing it to be pulled out together with the lower support roll. Since the roll changing bracket cannot be directly placed between the upper and lower support rolls located within the mill window, it requires frequent pulling and pushing of the lower support roll to transport the roll changing bracket. This frequent pulling and pushing of the lower support roll causes repeated stress on the support roll bearing housing, subjecting its internal bearings and locking devices to multiple axial impact loads, which negatively impacts its service life. The roll changing bracket and the lower support roll bearing housing are positioned and constrained by a positioning key, making hoisting operations difficult, inaccurate, and time-consuming. Furthermore, hoisting the roll changing bracket typically involves working near the edge of the roll changing pit, posing safety hazards to personnel. The pulling and pushing of the lower support roll to transport the roll changing bracket, as well as the hoisting, positioning, and removal of the roll changing bracket from the lower support roll, are time-consuming, affecting maintenance efficiency. Therefore, a new technical solution is urgently needed to address these problems. Summary of the Invention

[0005] The purpose of this invention is to provide a quick replacement device and method for rolling mill support rolls, which can complete the transportation of roll change brackets in a confined space without pulling or pushing the lower support rolls of the rolling mill. This eliminates the need for frequent pulling and pushing of the lower support rolls to transport the roll change brackets, thus achieving quick replacement of rolling mill support rolls and solving the problems existing in the background art.

[0006] The technical solution of this invention is:

[0007] A quick-change device for rolling mill support rolls includes a roll changing bracket, a moving frame, a V-shaped slider, and a flat slider. The roll changing bracket includes a base, columns, and a connecting horizontal tube. Two columns are respectively fixed on the base and connected together by the connecting horizontal tube. The moving frame includes a base frame and a hook fixed on the base frame. The base frame is fixed on the base in the roll changing bracket. The base frame is provided with a V-shaped slider that cooperates with the V-shaped track and a smooth block that cooperates with the flat track of the work roll. The V-shaped track and the flat track of the work roll form the work roll track.

[0008] The V-shaped slider and the flat slider are respectively fixed to the base frame of the mobile vehicle frame by locking bolts, forming a mobile trolley.

[0009] The base frame has a U-shaped structure. The bottom of the base frame has an internal threaded hole A, and the top of the base frame has a pin and a positioning baffle. The pin has an internal threaded hole B above it, and the height of the positioning baffle is higher than the height of the pin.

[0010] Both the V-shaped slider and the flat slider are cuboid structures. The V-shaped slider and the flat slider are respectively provided with countersunk through holes that match the internal threaded holes A on the base frame. The V-shaped slider is provided with a V-shaped groove at the bottom.

[0011] The V-shaped slider and the flat slider are respectively provided with guide angles on both sides to cooperate with the working roller track.

[0012] The base is provided with a protruding support plate, and the base frame in the mobile frame is fixed on the protruding support plate.

[0013] A rectangular boss is provided below the protruding support plate. The rectangular boss is located above the work roller track and is in contact with the base frame.

[0014] A circular through hole is provided above the protruding support plate.

[0015] The width of the rectangular boss is smaller than the width of the protruding support plate.

[0016] A method for quick replacement of rolling mill support rolls, employing the quick replacement device for rolling mill support rolls as defined above, and operating according to the following steps:

[0017] (1) Push in the roller changing support

[0018] The roll changing bracket and the moving trolley are hoisted together onto the transverse platform. After stopping the machine and removing the work roll, the transverse platform is moved and the moving trolley with the roll changing bracket is pushed into the mill window.

[0019] (2) Pull out the moving trolley

[0020] Lift the lower support roller so that the positioning key on the lower support roller is aligned with the keyway of the roller changing bracket. Continue to lift the lower support roller so that it lifts the roller changing bracket and disengages it from the pin on the moving trolley. Pull the moving trolley out onto the transverse platform.

[0021] (3) Replace the upper and lower roller systems:

[0022] The lower support roller is lowered to its original position, the upper support roller is lowered to the roller changing bracket, the transverse platform is opened, the upper and lower support rollers are pulled out and lifted away, replaced with new upper and lower support rollers and pushed in, and the upper support roller is lifted to detach from the roller changing bracket.

[0023] (4) Pull out the roller changing bracket

[0024] Raise the lower support roll, move the transverse platform and push the moving trolley into the mill window, so that the positioning baffle on the moving trolley contacts the protruding support plate on the outside of the roll changing bracket. At this time, the circular through hole of the protruding support plate of the roll changing bracket coincides with the pin on the moving trolley. Lower the lower support roll so that the roll changing bracket falls on the moving trolley, and pull the moving trolley out of the window.

[0025] The beneficial effects of this invention are: it enables the transport of the roll changing bracket within a confined space without the need for frequently pulling and pushing the lower support roll, thus facilitating rapid replacement of the mill support rolls. This reduces the number of times the lower support roll is pulled and pushed, decreases the number of times the roll changing bracket is hoisted, effectively reduces the maintenance time for replacing the support rolls, and also reduces the axial impact force experienced during support roll assembly. It features a simple structure, low manufacturing cost, convenient operation, and high safety and reliability, effectively improving the efficiency of mill support roll replacement and maintenance. Attached Figure Description

[0026] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0027] Figure 2 This is a schematic diagram of the roller changing support structure;

[0028] Figure 3 This is a structural schematic diagram of the mobile vehicle frame;

[0029] Figure 4 for Figure 3 Enlarged view at point X;

[0030] Figure 5 This is a schematic diagram of the V-shaped slider.

[0031] Figure 6 This is a schematic diagram of the smooth block structure;

[0032] Figure 7 This is a schematic diagram of the mobile cart.

[0033] Figure 8 This is a schematic diagram of the locking bolt structure;

[0034] Figure 9 Schematic diagram of the internal structure of the rolling mill window

[0035] Figure 10 This is a schematic diagram of the invention operating inside the rolling mill window.

[0036] Figure 11 This is a schematic diagram of the roller changing bracket being pushed in / ready to be pulled out according to the present invention.

[0037] Figure 12 This is a schematic diagram showing the separation / assembly of the roller changing bracket and the pin shaft in this invention;

[0038] Figure 13 This is a schematic diagram of the extraction / insertion of the mobile trolley according to the present invention;

[0039] Figure 14 This is a schematic diagram of the present invention for pulling out / pushing in the roller changing bracket;

[0040] Figure 15 This is a schematic diagram of the upper support roller, lower support roller, and original roller changing bracket.

[0041] In the picture:

[0042] 01-Work roll track, 011-Work roll V-shaped track, 012-Work roll flat track;

[0043] 02-Original roller changer bracket, 021-Base, 0211-Roller changer bracket keyway, 022-Column, 023-Connecting horizontal tube, 024-Connecting vertical tube;

[0044] 03-Working roll cooling water beam; 04-Lower support roll; 041-Positioning key; 05-Upper support roll;

[0045] 1-Roller changing bracket, 101-Protruding support plate, 102-Rectangular boss, 103-Circular through hole, 104-Rectangular notch, 105-Reinforcing rib;

[0046] 2-Mobile frame, 201-Base frame, 202-Tow hook, 203-Connecting rib, 204-Internal threaded hole A, 205-Guide angle, 206-Pin, 207-Internal threaded hole B, 208-Positioning baffle;

[0047] 3-V-shaped slider, 301-V-shaped groove, 302-countersunk through hole, 303-guide angle;

[0048] 4-Smooth block, 401-Counterhead through hole, 402-Guide angle;

[0049] 5-Locking bolt, 501-Screw, 502-Washer, 503-Anti-slip knurling. Detailed Implementation

[0050] The invention will be further described below with reference to the accompanying drawings and examples.

[0051] See attached document Figure 1-15 A quick-change device for rolling mill support rolls includes a roll changing bracket 1, a movable frame 2, a V-shaped slider 3, and a flat slider 4. The roll changing bracket 1 includes a base 021, columns 022, and a connecting horizontal tube 023. Two columns 022 are respectively fixed on the base 021, and the two columns 022 are connected together by the connecting horizontal tube 023. The movable frame 2 includes a base frame 201 and a tow hook 202 fixed on the base frame 201. The base frame 201 is fixed on the base 021 in the roll changing bracket 1. The base frame 201 is provided with a V-shaped slider 3 that cooperates with a V-shaped track 011 and a smooth block 4 that cooperates with a flat track 012. The V-shaped track 011 and the flat track 012 form the flat track 01 of the work roll.

[0052] In this embodiment, as Figure 1-8 As shown, the device includes a roller changing bracket 1, a moving frame 2, a V-shaped slider 3, a smoothing block 4, and a locking bolt 5, wherein:

[0053] The lower end of the roller changing bracket 1 is provided with a protruding support plate 101, and a rectangular boss 102 is provided below the protruding support plate 101. Its width is smaller than the width of the protruding support plate 101 and is consistent with the working roller track 01. A circular through hole 103 is provided above the protruding support plate 101, and a guide angle is provided below the circular through hole 103. Rectangular notches 104 are provided on both sides of the lower end base of the roller changing bracket 1. A triangular reinforcing rib 105 is provided at the lower end of the roller changing bracket 1. Other structures are consistent with the original roller changing bracket 02 structure.

[0054] The mobile frame 2 is composed of a base frame 201, a tow hook 202, and a connecting rib 203. The base frame 201 has internal threaded holes A204 at both ends of its lower side, a guide angle 205 at the front end of its front end, and pins 206 at both ends of its upper side. There are internal threaded holes B207 above the pins 206. A positioning baffle 208 is provided at the rear end of the upper side of the base frame 201. The width of the positioning baffle 208 is the same as the upper end face of the base frame 201, and its height is higher than the height of the pins 206. The tow hook 202 is consistent with the structure of the work roll tow hook in the roll changing system.

[0055] The V-shaped slider 3 is designed as a cube with a V-shaped groove 301 at the bottom. Its size and angle match the V-shaped track 011 of the working roller. The width of the V-shaped slider 3 is consistent with the width of the V-shaped track 011 of the working roller. The V-shaped slider 3 is provided with countersunk through holes 302, the size and spacing of which match the internal threaded holes A204 on the base frame 201. Guide angles 303 are provided on both sides of the V-shaped slider 3.

[0056] The smoothing block 4 has a cubic structure, and its width is consistent with the width of the working roller flat track 012. It is provided with countersunk through holes 401, the size and spacing of which match the internal threaded holes A204 on the base frame 201. The smoothing block 4 is provided with guide angles 402 on both sides.

[0057] The V-shaped slider 3 and the smoothing block 4 are fixed to the base frame 201 of the moving carriage 2 with hexagonal socket bolts, and are matched with the original work roller track 01. The moving carriage 2, together with the V-shaped slider 3 and the smoothing block 4, constitutes the moving trolley. The moving trolley can slide along the work roller track 01. The guide angle 205 of the base frame 201, the guide angle 303 of the V-shaped slider 3, and the guide angle 402 of the smoothing block 4 are used to ensure a smooth transition when the moving trolley slides on the work roller track 01, avoiding jamming caused by deviation at the interface of the work roller track 01.

[0058] The locking bolt 5 is composed of a bolt and a washer. The front end is provided with a screw 501, which can form a threaded connection with the internal threaded hole B207 of the moving frame 2. The middle part is provided with a washer 502, the outer diameter of which is larger than the diameter of the circular through hole 103 of the roller changing bracket 1. The rear end is provided with an anti-slip knurled 503.

[0059] The roller changing bracket 1 is installed above the moving trolley and is positioned by a pin 206 and a positioning baffle 208, and fixed by a locking bolt 5. The V-shaped slider 3 and the smooth block 4 of the moving trolley cooperate with and are positioned by the V-shaped track 011 and the flat track 012 of the working roller track, respectively. The rectangular boss 102 of the roller changing bracket 1 contacts the base frame 201 of the moving trolley and is located directly above the guide rail, so that the weight of the roller changing bracket 1 is evenly distributed on the track, preventing the base frame 201 of the moving trolley 2 from being deformed due to uneven force. The roller changing bracket 1 and the moving trolley can be connected to and driven by the original working roller changing drive device and the tow hook 202, so that they can move along the working roller track 01.

[0060] A schematic diagram of the internal structure of the rolling mill window is shown below. Figure 9-10 As shown, a work roll cooling water beam 03 is installed inside the mill window, with a small distance between it and the work roll track 01. Considering the limited space, to avoid interference between the roll changing support 1 and the work roll cooling water beam 03 during movement, the sum of the vertical thicknesses of the V-shaped slider 3 or smooth block 4, the moving frame 2 above it, and the protruding support plate 101 is less than or equal to the diameter of the work roll wheel. If there is slight interference between the original roll changing support 1 base and the work roll cooling water beam 03, the interference portions on both sides of the original roll changing support 1 base can be removed to form a smaller rectangular notch 103. At the same time, to increase the strength of the roll changing support 1, a reinforcing rib 104 is added to the base of the roll changing support 1, thereby avoiding interference between the roll changing support 1 and components such as the work roll cooling water beam 03 during movement.

[0061] After the roller changing bracket 1 is installed above the moving trolley, its bottom surface is higher than the bottom surface of the working roller track. That is, the bottom surface of the roller changing bracket 1 is higher than the connecting plate of the two tracks of the transverse platform, so that the roller changing bracket 1 does not interfere with the transverse platform during the movement.

[0062] The roller changing bracket 1 can rise and fall with the lower support roller 04. When the base of the roller changing bracket 1 contacts the raised bearing seat of the lower support roller 04, it can rise and fall together with the lower support roller 04, thereby separating and engaging the circular through hole 103 of the roller changing bracket 1 with the pin 206 of the moving trolley. With the assistance of the positioning baffle 208, the roller changing bracket can be moved by the moving trolley and the lower support roller 04.

[0063] See Figure 11-15 As shown, the replacement of the mill support rolls shall be performed according to the following detailed steps.

[0064] (1) Push in the roller changing bracket

[0065] Before maintenance shutdown, the roll changing bracket 1 and the moving trolley are hoisted onto the transverse platform as a whole and the locking bolts are removed. After stopping the machine and pulling out the work roll, the transverse platform is moved and the moving trolley with the roll changing bracket 1 is pushed into the mill window with the help of the original roll changing drive device.

[0066] (2) Pull out the moving trolley

[0067] The lower support roller 04 is lifted by jogging, and the position of the moving trolley is finely adjusted so that the positioning key 041 on the lower support roller 04 is aligned with the keyway 0211 of the roller changing bracket. The lower support roller 04 is then lifted so that it lifts the roller changing bracket 1 and disengages it from the pin 206 on the moving trolley. The moving trolley is then pulled out onto the transverse platform using the original roller changing drive device.

[0068] (3) Replace the upper and lower roller systems

[0069] Lower support roller 04 descends to its original position, upper support roller 05 descends onto roller changing bracket 1, the transverse platform is opened, the upper and lower support rollers are pulled out and lifted away, replaced with new upper and lower support rollers and pushed in, and the upper support roller is lifted to disengage from the roller changing bracket.

[0070] (4) Pull out the roller changing bracket

[0071] Raise the lower support roll 04, move the transverse platform and push the moving trolley into the mill window with the help of the original roll changing drive device, so that the positioning baffle 208 on the moving trolley frame contacts the outer protruding support plate 101 of the roll changing bracket 1. At this time, the circular through hole 103 on the protruding support plate 101 coincides with the pin 206 on the moving trolley. Lower the lower support roll 04 so that the roll changing bracket 1 falls on the moving trolley. Use the original roll changing drive device to pull the moving trolley out of the window and perform subsequent recovery operations. After the maintenance is completed or during the work break, install the locking bolt 5 to connect the roll changing bracket 1 and the moving trolley, and lift it away.

Claims

1. A quick-change device for rolling mill support rolls, characterized in that: The system includes a roller changing bracket (1), a mobile frame (2), a V-shaped slider (3), and a flat slider (4). The roller changing bracket (1) includes a base (021), columns (022), and a connecting horizontal tube (023). The two columns (022) are fixed on the base (021) respectively, and the two columns (022) are connected together by the connecting horizontal tube (023). The mobile frame (2) includes a base frame (201) and a hook (202) fixed on the base frame (201). The base frame (201) is fixed on the base (021) in the roller changing bracket (1). The base frame (201) is provided with a V-shaped slider (3) that cooperates with the V-shaped track (011) and a smooth block (4) that cooperates with the working roller flat track (012). The V-shaped track (011) and the working roller flat track (012) form the working roller track (01). The V-shaped slider (3) and the flat slider (4) are respectively fixed to the base frame (201) of the mobile frame (2) by locking bolts (5) to form a mobile trolley; The base frame (201) has a U-shaped structure. The base frame (201) has an internal threaded hole A (204) at the bottom and a pin (206) and a positioning baffle (208) at the top. The pin (206) has an internal threaded hole B (207) above it. The height of the positioning baffle (208) is higher than the height of the pin (206). A protruding support plate (101) is provided below the base (021), and the base frame (201) in the mobile frame (2) is fixed on the protruding support plate (101); A rectangular boss (102) is provided below the protruding support plate (101). The rectangular boss (102) is located above the work roller track (01) and in contact with the base frame (201). A circular through hole (103) is provided above the protruding support plate (101). The roller changing bracket (1) is installed above the moving trolley and is positioned by means of pin (206) and positioning baffle (208) and fixed by locking bolt (5).

2. The quick-change device for rolling mill support rolls according to claim 1, characterized in that: The V-shaped slider (3) and the flat slider (4) are both cuboid structures. The V-shaped slider (3) and the flat slider (4) are respectively provided with countersunk through holes that match the internal threaded hole A (204) on the base frame (201). The V-shaped slider (3) is provided with a V-shaped groove (301) below it.

3. A quick-change device for rolling mill support rolls according to claim 2, characterized in that: The V-shaped slider (3) and the flat slider (4) are respectively provided with guide angles that cooperate with the working roller track (01).

4. The quick-change device for rolling mill support rolls according to claim 1, characterized in that: The width of the rectangular boss (102) is smaller than the width of the protruding support plate (101).

5. A method for quick replacement of rolling mill support rolls, characterized in that: The quick-change device for mill support rolls as defined in any one of claims 1-4 is used, and the operation is performed according to the following steps: (1) Push in the roller changing bracket The roll changing bracket (1) and the moving trolley are hoisted together onto the transverse platform. After stopping the machine and removing the work roll, the transverse platform is moved and the moving trolley with the roll changing bracket (1) is pushed into the mill window. (2) Pull out the moving trolley Lift the lower support roller (04) so ​​that the positioning key (041) on the lower support roller (04) is aligned with the keyway (0211) of the roller changing bracket. Continue to lift the lower support roller (04) so ​​that the lower support roller (04) lifts the roller changing bracket (1) and disengages it from the pin (206) on the moving trolley. Pull the moving trolley out onto the transverse platform. (3) Replace the upper and lower roller systems: The lower support roller (04) descends to its original position, the upper support roller (05) descends to the roller changing bracket (1), the transverse platform is opened, the upper and lower support rollers are pulled out and lifted away, replaced with new upper and lower support rollers and pushed in, and the upper support roller is lifted to disengage from the roller changing bracket (1). (4) Pull out the roller changing bracket Raise the lower support roll (04), move the transverse platform and push the moving trolley into the mill window, so that the positioning baffle (208) on the moving frame (2) contacts the outer protruding support plate (101) of the roll changing bracket (1). At this time, the circular through hole (103) of the protruding support plate (101) of the roll changing bracket (1) coincides with the pin (206) on the moving trolley. Lower the lower support roll (04) so ​​that the roll changing bracket falls on the moving trolley and pull the moving trolley out of the window.

Images